Process of preparing derivatives of dibenzanthronyl



Patented June 26, 1928.

UNITED STATES PATENT OFFICE.

KARL ZAHN AND PAUL OCHWA'I, OF HOCHST-ON-THE-MAIN. GERMANY, ASSIGNORS TO GRASSELLI DYESTUFF CORPORATION. OF NEW YORK. N. Y.. A. CORPORATION OF DELAWARE.

PROCESS OF PREPARING DERIVATIVES OF DTBENZANTHRONYL.

No Drawing. Application filed December 28, 1926, Serial No. 157.611, and in Germany December 30, 1926.

wherein X stands for an alkyl residue.

The following example serves to illustrate our invention, but it is not intended to limit it thereto, all parts being by weight:

10 parts of 'Bz1-iodo-Bz2;methoxybanzanthrone of the melting point 248 C. which is easily obtainable by one of the known methods, are heated to boiling for 5 hours in parts of nitrobenzene with 10 parts of copper powder, and the hot solution is then filtered. After the filtrate has cooled, the separated product is drawn oti' by suction, washed and dried. The 1322-1322- dimethoxy-Bzl-BzY-dibenzanthronyl thus prepared forms brown needles of the melting point 387390 C. and is soluble in concentrated sulfuric acid to a claret-red solution.

We claim 1. As new products. compounds of the general formula:

wherein X stands for an alkyl residue.

2. As a new product, a compound of the OCH;

which Forms brown needles melting at 387- 39U and dissolves in concentrated sulfuric acid to a claret-red solution.

3. In a process for preparing derivatives prising heating a. B21-iodo-Bz2- nethozry- 0f dibenzanthronyl the step corn rising heatbenzanthrone with copper powder in an ining an ether of Bz1-i0do-Bz2- ydroxybendifferent solvent. 1H zanthrone with copper powder in an indif- In tes imony whereof, we aflix our s1gna- 5 ferent solvent. tin-es.

4. In a process for preparing vat dyestufl's KARL ZAHN. of the dibenzanthrone series the step con1- PAUL OCHWAT.

CERTIFICATE OF CORRECTION.

atent No. 1,675,014. Granted June 26, 1928, to

KARL ZAHN ET AL.

it is hereby certified that error appears in the rinte aboire numbered patent requiring correction as fol loviis: P gi g l iiil s tiil d i claim 4 strike out the words "vat dyestuffs of the dibenzanthr one series" and F Insert instead "derivatives of dihenzanthronyl"; and thatthe said Letters P t t should be read with this correction therein that the same may conic t tli en record of the case in the Patent Office. m 0 e Signed and sealed this 7th day of August, A. D. 1928.

M. J. Moore Seal Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,675,014. Granted June 26, 1928, to

KARL ZAHN ET AL.

It is hereby certified that. error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, claim 2, in the formula the upper radical "0 C H sub 3" should be connected by its bond to the lower right hand corner of the adjacent ring and the lower radical "O C H sub 3" should be connected by its bond to the upper right corner of the adjacent ring, so that both of the radicals will occupy the relative positions of the radicals "O X" in claim 1; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of September, A. D. 1928. i

v M. J. Moore, (Seal) M na Commissioner of Patents.

3. In a process for preparing derivatives prising heating a. B21-iodo-Bz2- nethozry- 0f dibenzanthronyl the step corn rising heatbenzanthrone with copper powder in an ining an ether of Bz1-i0do-Bz2- ydroxybendifferent solvent. 1H zanthrone with copper powder in an indif- In tes imony whereof, we aflix our s1gna- 5 ferent solvent. tin-es.

4. In a process for preparing vat dyestufl's KARL ZAHN. of the dibenzanthrone series the step con1- PAUL OCHWAT.

CERTIFICATE OF CORRECTION.

atent No. 1,675,014. Granted June 26, 1928, to

KARL ZAHN ET AL.

it is hereby certified that error appears in the rinte aboire numbered patent requiring correction as fol loviis: P gi g l iiil s tiil d i claim 4 strike out the words "vat dyestuffs of the dibenzanthr one series" and F Insert instead "derivatives of dihenzanthronyl"; and thatthe said Letters P t t should be read with this correction therein that the same may conic t tli en record of the case in the Patent Office. m 0 e Signed and sealed this 7th day of August, A. D. 1928.

M. J. Moore Seal Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,675,014. Granted June 26, 1928, to

KARL ZAHN ET AL.

It is hereby certified that. error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, claim 2, in the formula the upper radical "0 C H sub 3" should be connected by its bond to the lower right hand corner of the adjacent ring and the lower radical "O C H sub 3" should be connected by its bond to the upper right corner of the adjacent ring, so that both of the radicals will occupy the relative positions of the radicals "O X" in claim 1; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of September, A. D. 1928. i

v M. J. Moore, (Seal) M na Commissioner of Patents. 

